Table 1.

The association between mean relatedness among adult females (including intraspecific variation) and allomaternal care for mammals in the dataset (n = 44 species, number of parameters = 4). Results are shown (i) without phylogenetic correction (ordinary least squares), and (ii) with phylogenetic correction (generalized least squares). The coefficient of intercept shows mean relatedness for species without allomaternal care.

	coefficient (s.e.)	F	p	AICc
(i) without phylogeny				−18.4
intercept	0.03 (0.04)
allomaternal care	0.50 (0.08)	37.7	<0.0001
sqrt(number of females)	−0.002 (0.008)	0.07	0.787
allocare×sqrt(number of females)	−0.10 (0.03)	11.6	0.002
(ii) with phylogeny				−18.5
intercept	0.04 (0.04)
allomaternal care	0.50 (0.08)	35.3	<0.0001
sqrt(number of females)	−0.0009 (0.008)	0.01	0.917
allocare×sqrt(number of females)	−0.10 (0.03)	11.7	0.002